
/* ====================================================================
   Copyright 2002-2004   Apache Software Foundation

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
==================================================================== */
        


package org.dlsu.mt.preprocessing;

public class PieceDescriptor
{

  short descriptor;
   private static BitField fNoParaLast = new BitField(0x01);
   private static BitField fPaphNil = new BitField(0x02);
   private static BitField fCopied = new BitField(0x04);
  int fc;
  short prm;
  boolean unicode;


  public PieceDescriptor(byte[] buf, int offset)
  {
    descriptor = LittleEndian.getShort(buf, offset);
    offset += LittleEndian.SHORT_SIZE;
    fc = LittleEndian.getInt(buf, offset);
    offset += LittleEndian.INT_SIZE;
    prm = LittleEndian.getShort(buf, offset);

    // see if this piece uses unicode.
    if ((fc & 0x40000000) == 0)
    {
        unicode = true;
    }
    else
    {
        unicode = false;
        fc &= ~(0x40000000);//gives me FC in doc stream
        fc /= 2;
    }

  }

  public int getFilePosition()
  {
    return fc;
  }

  public void setFilePosition(int pos)
  {
    fc = pos;
  }

  public boolean isUnicode()
  {
    return unicode;
  }

  protected byte[] toByteArray()
  {
    // set up the fc
    int tempFc = fc;
    if (!unicode)
    {
      tempFc *= 2;
      tempFc |= (0x40000000);
    }

    int offset = 0;
    byte[] buf = new byte[8];
    LittleEndian.putShort(buf, offset, descriptor);
    offset += LittleEndian.SHORT_SIZE;
    LittleEndian.putInt(buf, offset, tempFc);
    offset += LittleEndian.INT_SIZE;
    LittleEndian.putShort(buf, offset, prm);

    return buf;

  }

  public static int getSizeInBytes()
  {
    return 8;
  }

  public boolean equals(Object o)
  {
    PieceDescriptor pd = (PieceDescriptor)o;

    return descriptor == pd.descriptor && prm == pd.prm && unicode == pd.unicode;
  }
}
